(The Usual Error is a book. But it's freely available on a website, so I have no problem listing this as a recommendation of a website!)
The Usual Error is a book about how to communicate well! I know the authors have good ideas about that, because the book itself is an example of good communication. If you like my writing style on this website, you will probably like the book, because there are a lot of similarities between its style and mine.
I do have one qualm about it: Not everything it says is true for everybody, and it doesn't always do a good job of being aware of that. If you keep that in mind, it's a very good read.
– EliApproximate readability: 5.58 (519 characters, 129 words, 8 sentences, 4.02 characters per word, 16.12 words per sentence)